Millwright: Hydraulics Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
What is pressure defined as? Force per unit area F=(P)(A)
This pressure gauge has a d. schrader gauge
calibrated
dial face with a pointer attached
through linkage to a plunger and a
bias spring. This system pressure
is
connected to the gauge and acts
on
the plunger.
a. bourdon tube
b. siphon
c. flow meter
d. schrader gauge
What job does a flow control valve Controls the volume of fluid entering a port
perform in a hydraulic system? of the
system to vary the speed
,This is used in a hydraulic circuit b. invert emulsion fluids
as
petroleum based liquid with 40%
water content which acts as oil
a. petroleum based oil
b. invert emulsions
c. glycol
d. vegtetable oils
This is used as a fluid in a d. synthesized hydrocarbons
hydraulic
circuit when there is extreme high
and low temperature ranges
a. petroleum based oil
b. invert emulsions
c. glycol
d. synthesized hydrocarbons
You would use this valve if a large c. pilot operated relief vavle
amount of fluid is to be relieved This is a NC valve
under a small pressure differential
a. PRV
b. sequencing valve
c. pilot operated relief vavle
d. unloading valve
What is the purpose of a relief It limits the maximum pressure in the
valve system
in a hydraulic system? Maintains maximum system pressure
Safety as well for system not over
pressurizing
, List four (4) purposes that a) Power transmission
hydraulic b) Cooling
fluid serve in a hydraulic system. c) Sealing
d) Lubrication
Describe cavitations and list four Cavitation is caused by restricted flow to
(4) the
causes of this problem. suction side of pump. When oil is under
1) Inlet not large enough pressure
2) Plugged strainer on discharge side of pump, the air bubbles
3) Viscosity too high will
4) Too low operating temps or high implode.
operating temperatures
5) Over speed
6) Leaking system lines
This is a NC 2 way valve. It has a b. sequencing valve
pilot
lint that senses the pressure of the
inlet port and a line that drains the
spring chamber back to reservoir
(external drain)
a. PRV
b. sequencing valve
c. pilot operated relief vavle
d. unloading valve
How are oil filters used in hydraulic By there micron rate
systems and rated? Beta ratio
By there micron rate
Beta ratio
Answers with Verified Solutions | Latest
Updated 2026
What is pressure defined as? Force per unit area F=(P)(A)
This pressure gauge has a d. schrader gauge
calibrated
dial face with a pointer attached
through linkage to a plunger and a
bias spring. This system pressure
is
connected to the gauge and acts
on
the plunger.
a. bourdon tube
b. siphon
c. flow meter
d. schrader gauge
What job does a flow control valve Controls the volume of fluid entering a port
perform in a hydraulic system? of the
system to vary the speed
,This is used in a hydraulic circuit b. invert emulsion fluids
as
petroleum based liquid with 40%
water content which acts as oil
a. petroleum based oil
b. invert emulsions
c. glycol
d. vegtetable oils
This is used as a fluid in a d. synthesized hydrocarbons
hydraulic
circuit when there is extreme high
and low temperature ranges
a. petroleum based oil
b. invert emulsions
c. glycol
d. synthesized hydrocarbons
You would use this valve if a large c. pilot operated relief vavle
amount of fluid is to be relieved This is a NC valve
under a small pressure differential
a. PRV
b. sequencing valve
c. pilot operated relief vavle
d. unloading valve
What is the purpose of a relief It limits the maximum pressure in the
valve system
in a hydraulic system? Maintains maximum system pressure
Safety as well for system not over
pressurizing
, List four (4) purposes that a) Power transmission
hydraulic b) Cooling
fluid serve in a hydraulic system. c) Sealing
d) Lubrication
Describe cavitations and list four Cavitation is caused by restricted flow to
(4) the
causes of this problem. suction side of pump. When oil is under
1) Inlet not large enough pressure
2) Plugged strainer on discharge side of pump, the air bubbles
3) Viscosity too high will
4) Too low operating temps or high implode.
operating temperatures
5) Over speed
6) Leaking system lines
This is a NC 2 way valve. It has a b. sequencing valve
pilot
lint that senses the pressure of the
inlet port and a line that drains the
spring chamber back to reservoir
(external drain)
a. PRV
b. sequencing valve
c. pilot operated relief vavle
d. unloading valve
How are oil filters used in hydraulic By there micron rate
systems and rated? Beta ratio
By there micron rate
Beta ratio
